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• W2259205158 abstract "Chronic administration of phencyclidine (PCP) to rats has been demonstrated to produce a sensitized locomotor response to PCP challenge that is associated with apoptotic cell death and an up-regulation of the N-methyl-D-aspartate (NMDA) receptor. To determine the underlying mechanisms, dissociated forebrain cultures were treated for 2 days with 3 microM PCP. After washout of PCP, NMDA was added (in the presence of Mg(2+)) for 20 h. The uptake of a vital dye and the release of lactate dehydrogenase measured cell viability. Apoptosis was assessed by an enzyme-linked immunosorbent assay that was specific for fragmented (histone-associated) DNA and an in situ assay for nicked DNA, terminal dUTP nick-end labeling. These assays showed that the effect of a nontoxic concentration of NMDA (30 microM) became lethal to approximately one-third of the neurons after chronic (48-h) PCP treatment. This treatment also resulted in a 47% increase in NR1 subunit mRNA, suggesting that NMDA-induced neuronal cell death after chronic PCP is due to NMDA receptor up-regulation. Furthermore, exposure of PCP-treated cultures to NMDA led to increased expression of Bax and decreased expression of Bcl-X(L). The Bcl-X(L)/Bax ratio was markedly decreased by 30 microM NMDA in the PCP-treated, but not control, cultures. Addition of superoxide dismutase and catalase prevented the decrease in Bcl-X(L)/Bax. This study suggests that NMDA-induced changes in Bax and/or Bcl-X(L) involve the formation of reactive oxygen species. By extrapolation, these data suggest that PCP-induced apoptosis in vivo may involve similar mechanisms and that cultured neurons may be a suitable model for the mechanistic study PCP toxicity in vivo." @default.
• W2259205158 created "2016-06-24" @default.
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• W2259205158 date "2000-07-01" @default.
• W2259205158 modified "2023-09-23" @default.
• W2259205158 title "Mechanisms of N-methyl-D-aspartate-induced apoptosis in phencyclidine-treated cultured forebrain neurons." @default.
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